JP2003228326A - Light emitting circuit for organic electroluminescence element and display device therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a light emitting circuit and a display device which are capable of performing refresh operation of an organic electroluminescence element (EL element) connected in series with a diode for improving average luminance with a relatively simple constitution. <P>SOLUTION: The light emitting circuit is provided with a 1st diode element connected in series with the EL element with the polarity made to be forward- directional as that of the EL element, and a capacitive element connected with the node of the EL element and the diode element, halting the supply of the light emitting driving current according to a light emitting halt instruction to apply voltage of the reverse polarity to the forward polarity of the EL element and the diode element each the series circuit thereof, and generating a reverse voltage of the forward voltage of the EL element to the series circuit of the EL element and the capacitive element by temporarily varying the potential at the opposite end of the connection point with the capacitive element while the reverse voltage is applied. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a light emitting circuit and a display device using an organic electroluminescence element.

[0002]

2. Description of the Related Art An organic electroluminescence device (hereinafter simply referred to as an EL device) which is one of capacitive light emitting devices.
Can be electrically represented by an equivalent circuit as shown in FIG. As can be seen from FIG. 1, the element has a capacitance component C
And a component E having a diode characteristic that is coupled in parallel with the capacitance component. Therefore, E
The L element is considered to be a capacitive light emitting element. EL
When a direct current light emission drive voltage is applied between the electrodes,
When the electric charge is accumulated in the capacitance component C and subsequently exceeds the barrier voltage or the emission threshold voltage peculiar to the device, a drive current starts to flow from the electrode (the anode side of the diode component E) to the organic functional layer serving as the emission layer. It emits light with an intensity proportional to the current.

The characteristic of voltage V-current I-luminance L of such an element is similar to the characteristic of a diode as shown in FIG. 2, and the current I is extremely small at a voltage equal to or lower than the light emission threshold voltage Vth. When the voltage becomes equal to or higher than the voltage Vth, the current I rapidly increases. Further, the current I and the luminance L are almost proportional. Such an element exhibits light emission luminance proportional to a current corresponding to the drive voltage when a drive voltage exceeding the light emission threshold voltage Vth is applied to the element, and is driven if the applied drive voltage is equal to or less than the light emission threshold voltage Vth. No current flows and the emission brightness remains equal to zero.

[0004]

In such an EL element, when a voltage reverse to the forward direction, that is, a reverse bias voltage is sometimes applied to the EL element whose function has deteriorated due to repeated light emission,
It is known that there is a refreshing action that the function of the EL element is restored. On the other hand, in a light emitting circuit that drives an EL element to emit light, when a diode is connected in series to the EL element and a drive current is supplied to the EL element through the diode, the charge accumulated in the capacitive component of the EL element due to the drive current. It is already known that the EL element continues to emit light for some period even after the supply of the drive current is stopped. This technology arranges multiple EL elements in a matrix.
In particular, in a display device which drives a display panel with a large number of lines by line scanning, when the scanning period for each line is short, E
It is effective for improving the average luminance of the L element.

However, in a light emitting circuit having a configuration in which a diode is connected in series to an EL element, there is a problem that it is difficult to apply a reverse bias voltage to the EL element to provide a refresh function. Therefore, an object of the present invention is to provide an EL element light emitting circuit and a display device capable of giving a refreshing action to an EL element in which a diode is connected in series in order to improve average luminance, with a relatively simple structure. Is.

[0006]

A light emitting circuit for an EL element of the present invention is a light emitting circuit for emitting light from an organic electroluminescent element, and is connected in series with the organic electroluminescent element in the same forward polarity. A diode element, a capacitive element connected to a connection point between the organic electroluminescence element and the diode element,
Drive current supply means for supplying a forward drive current to the organic electroluminescence element and the capacitive element via the diode element in response to the light emission command, and supply of a light emission drive current by the drive current supply means for the light emission stop command. Driving current stopping means for stopping and applying a voltage in the reverse direction of the forward polarity of each of the organic electroluminescent element and the diode element to the series circuit of the organic electroluminescent element and the diode element, and the reverse direction by the driving current stopping means In the series circuit of the organic electroluminescent element and the capacitive element by temporarily changing the potential at one end on the side opposite to the connection point of the capacitive element during application of the voltage of the forward polarity of the organic electroluminescent element is Reverse bias applying means for generating a reverse voltage, That.

The light emitting circuit of the EL element of the present invention is a light emitting circuit for emitting light from an organic electroluminescent element, and comprises a diode element connected in series with the organic electroluminescent element having the same forward polarity as that of the organic electroluminescent element.
A first potential higher than the reference potential is applied to the capacitive element connected to the organic electroluminescence element at the connection point between the organic electroluminescence element and the diode element, and to one end opposite to the connection point of the organic electroluminescence element. And a first potential applying means for generating a voltage in the direction opposite to the forward polarity of the organic electroluminescent element in response to the light emission current supply command, and a forward light emission drive current to the capacitive element via the diode element. Drive current supply means for supplying, and drive current stop means for stopping the supply of the light emission drive current by the drive current supply means in response to the current supply stop command to generate a voltage in the diode element in a direction opposite to its forward polarity. It is characterized by having.

The display device of the present invention includes a display panel in which a plurality of light emitting cells each including an organic electroluminescence element are arranged in a matrix, and a light emitting cell to be made to emit light among the plurality of light emitting cells according to input image data. A light emitting cell designating means for designating a light emitting cell, and a light emitting driving means for causing the organic electroluminescent element of the light emitting cell designated by the light emitting designating means to emit light. A diode element connected in series with polarities in the same direction, and a capacitive element connected to a connection point of the organic electroluminescent element and the diode element are provided, and the light emission drive means is designated by the light emission designating means. Diodes for organic electroluminescent elements and capacitive elements of light emitting cells Drive current supply means for supplying a drive current in the forward direction via a child, and an organic electroluminescent element and a diode for stopping the supply of the light emission drive current by the drive current supply means when the designation of the designated light emitting cell is completed. Driving current stopping means for applying a voltage in the reverse direction of the forward polarity of each of the organic electroluminescent element and the diode element to a series circuit with the element, and a capacitive element while applying a reverse voltage by the driving current stopping means Reverse bias that temporarily changes the potential at one end on the side opposite to the connection point to generate a voltage in the series circuit of the organic electroluminescent element and the capacitive element in the direction opposite to the forward polarity of the organic electroluminescent element. And an application unit.

The display device of the present invention includes a display panel in which a plurality of light emitting cells each including an organic electroluminescence element are arranged in a matrix, and a light emitting cell to be made to emit light among the plurality of light emitting cells according to input image data. A light emitting cell designating means for designating a light emitting cell, and a light emitting driving means for causing the organic electroluminescent element of the light emitting cell designated by the light emitting designating means to emit light. A diode element connected in series with polarities in the same direction, and a capacitive element connected to a connection point between the organic electroluminescent element and the diode element, and the light emission drive means includes a plurality of light emitting cells. One end on the side opposite to the connection point of the organic electroluminescence element is higher than the reference potential. The first potential applying means for applying a potential and the organic electroluminescence element of the light emitting cell designated by the light emission designating means, while generating a voltage in the direction opposite to the forward polarity, forward to the capacitive element via the diode element. Drive current supply means for supplying a light emission drive current in a direction, and when the designation of the specified light emitting cell is completed, the supply of the light emission drive current by the drive current supply means is stopped to reverse the forward polarity to the diode element. Drive current stopping means for generating a directional voltage.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 3 shows the configuration of a display device to which the present invention is applied. This display device includes a display panel 11, a display control circuit 12, a scanning reverse bias circuit 13, and a drive current supply circuit 14.

As shown in FIG. 4, the display panel 11 has drive lines A1 to Am in the column direction and scan lines B1 to Bn in the row direction (line direction) arranged in a matrix, and the drive lines A1 to Am and Light emitting cells 20 _{1,1 to} 20 _{m, n} are provided at each of a plurality of intersections of the scanning lines B1 to Bn.
The display panel 11 is provided with reverse bias lines C1 to Cn in parallel with the scanning lines B1 to Bn, respectively.

The light emitting cells 20 _{1,1 to} 20 _{m, n} all have the same structure. Explaining the light emitting cell 20 _1,1 , E
An L element 21, a diode 22 and a capacitor 23 are provided. The anode of the diode 22 is connected to the drive line A ₁ , and the cathode is connected to the anode of the EL element 21 and one end of the capacitor 23. The cathode of the EL element 21 is connected to the scanning line B1, and the other end of the capacitor 23 is connected to the reverse bias line C1.

The display control circuit 12 generates a scanning signal, a drive control signal and a bias control signal according to the input image data. The scanning signal is a signal that sequentially selects one scanning line among the scanning lines B _{1 to} B _n in one frame period. The drive control signal is the EL of the light emitting cell corresponding to one scanning line.
This is a signal for instructing the supply of the drive current to the drive line of the drive lines A1 to Am corresponding to the EL element that should emit light according to the image data of the element. The bias control signal is delayed by the scanning timing of the scanning signal, and the reverse bias line C
This is a signal for selecting one bias line from 1 to Cn and instructing the application of the reverse bias voltage to the EL element of the light emitting cell corresponding to the one reverse bias line. The scan signal and the bias control signal are supplied to the scan reverse bias circuit 13, and the drive control signal is supplied to the drive current supply circuit 14.

The scanning reverse bias circuit 13 includes a reverse bias changeover switch 31 _{1 to} 31 _n and a scan changeover switch 32 _1.
.About.32 _n and connected to the scanning lines B1 to Bn and the reverse bias lines C1 to Cn. Reverse bias change-over switch 31 ₁ to 31 _n are provided corresponding to the reverse bias line C1 to Cn, selectively either the potential Vcc and ground potential (reference potential) in response to a bias control signal The corresponding reverse bias lines C1 to Cn are supplied. The changeover switches 32 _{1 to} 32 _n for scanning are provided corresponding to the scanning lines B1 to Bn, and the scanning lines B1 to Bn selectively corresponding to either one of the potential Vcc and the ground potential according to the scanning signal. Supply to. Note that Vcc> 7V.

The drive current supply circuit 14 includes current sources 33 ₁ ...
33 _m and switches 43 ₁ to 43 _m , and drive lines A ₁ to
It is connected to Am. The current sources 33 _{1 to} 33 _m supply a drive current to any of the drive lines A1 to Am according to the drive control signal. The switches 43 ₁ to 43 _m make the drive lines A1 to Am equal to the ground potential according to the drive control signal. In the display device having such a configuration, the operation when the EL element 21 of the light emitting cell 20 _1,1 is driven to emit light by the display control circuit 12 will be described with reference to FIG. In this explanation, as shown in FIG. 3, the anode potential of the diode 22 (potential of the driving line A1) is a, the cathode potential of the EL element 21 (potential of the scanning line B1) is b, and the terminal potential of the capacitor 23 (reverse potential). The potential of the bias line C1 is c, and the EL element 2 is
The anode potential of 1 is d.

When the EL element 21 emits light, the light emitting cell 2
As the operation mode of 0 _1,1 , as shown in FIG. 4, the scanning mode in which the lines of the light emitting cells 20 _{1,1 to} 20 _{m, 1} are scanned and the light emission of the EL element 21 immediately after the scanning is completed. There is a continuous light emission mode for maintaining the above condition and a reverse bias application mode for applying a reverse bias voltage to the EL element 21. In the scan mode, the reverse bias changeover switch 31 ₁ and the scan changeover switch 32 ₁ perform a switching operation in response to the scan signal from the display control circuit 12, and the reverse bias changeover switch 31 ₁ reverses the ground potential 0V. It is relayed to the line C1 and the ground potential 0V is relayed to the scanning line B1 by the scanning changeover switch 32 ₁ . At the same time as these relay operations, the current source 33 ₁ operates in response to the drive control signal from the display control circuit 12 to emit light from the EL element 21, supplies a drive current to the drive line A1, and turns off the switch 43 _1. Become.

Since the diode 22 is turned on, the drive current from the current source 33 ₁ is supplied to the drive line A1 and the diode 2
2, EL element 21, scanning line B1, and changeover switch 3
It flows into the ground through a 2 _1. The EL element 21 emits light when the drive current flows in this manner. The drive current charges the capacitive component of the EL element 21. Further, a part of the drive current from the current source 33 ₁ becomes a charging current and flows from the diode 22 to the ground via the capacitor 23 and the reverse bias changeover switch 31 ₁ to charge the capacitor 23.

In this scanning mode, the potential a of the drive line A1 becomes, for example, about 10 V, and the potential b of the scan line B1.
And the potential c of the reverse bias line C1 is 0V which is the ground potential.
Therefore, the anode potential d of the EL element 21 becomes about 7V. Next, when the scanning time assigned to the scanning line B1 elapses, the light emission maintaining mode is set. In the light emission maintaining mode, the contents of the scan signal and the drive control signal from the display control circuit 12 change, the scanning of the scanning line B1 ends, and the selected scanning line shifts to the scanning line B2. As a result, the reverse bias changeover switch 31 ₁ and the scan changeover switch 32 ₁ perform a switching operation. The potential Vcc is relayed to the reverse bias line C1 by the reverse bias changeover switch 31 ₁ , and the potential Vcc is relayed to the scan line B1 by the scanning changeover switch 32 ₁ . At the same time, the current source 33 ₁ stops the supply of the drive current to the drive line A1 and the switch 43 ₁ is turned on, or the EL element of the light emitting cell at the intersection of the other selected scanning line and the drive line A1 emits light. Drive current is supplied to the drive line A1 and the switch 43 ₁ is turned off.

In the light emission sustaining mode, the drive line A for the drive current is
When the supply to 1 is stopped, the potential a of the drive line A1 is 0
V, and the diode 22 is turned off. Both the potential b of the scanning line B1 and the potential c of the reverse bias line C1 rise to Vcc. The EL element 21 has a stored charge of a capacitive component,
Since the stored charge also exists in the capacitor 23, the stored charge flows as a forward current into the diode component of the EL element 21, and the EL element 21 continues to emit light. Therefore, assuming that the anode potential d of the EL element 21 is approximately Vcc + Vα, Vα = 7V. In the EL element 21, the forward voltage of the EL element 21 is reduced to the light emission threshold voltage V due to the decrease of the stored charge.
When th (for example, Vα = 3V) is exceeded, light emission is stopped, and the light emission maintaining mode ends.

Next, when the bias control signal is generated from the display control circuit 12, the reverse bias application mode is set.
In the reverse bias application mode, the scanning reverse bias circuit 13 displays the display control circuit 12 in response to the bias control signal.
Perform reverse bias change-over switch 31 ₁ is switched operation in response to a bias control signal from, for supplying the ground potential 0V to the reverse bias line C1 instead of the potential Vcc. The change from the potential Vcc at the terminal on the reverse bias line C1 side of the capacitor 23 to 0 V corresponds to the potential at the terminal on the opposite side of the capacitor 23, that is, the anode potential d of the EL element 21. Current source 33 ₁
Stops supplying drive current to the drive line A1 and the switch 43 ₁ is on.

EL after the potential of the reverse bias line C1 has changed
The anode potential d of the element 21 is represented by Vα + Vβ. Vα
= 3V remains. Cel storage capacity of EL element 21
l, and the storage capacity of the capacitor 23 is C23, Vβ
Since the voltage Vcc is divided by the two storage capacitors Cell and C23, Vβ = Vcc × Cell / (Cell +
C23). Forward voltage Vell of EL element 21 in the forward direction
Is Vα + Vβ−Vcc.

The potential Vcc is set sufficiently high, and C23> C
If, for example, C23 is set to be 2 to 4 times as high as Cell so that it becomes ell, the inter-terminal voltage Vell of the EL element 21 becomes smaller than 0 V, so that the EL element 21 is in the reverse bias state and the EL element 21 Is given a refreshing effect.
In the reverse bias application mode, the residual charges of the EL element 21 and the capacitor 23 remain as they are, so that the anode potential d is maintained. A reverse bias application mode is terminated in response to the disappearance of the bias control signal from the display control circuit 12, the changeover switch 31 ₁ for reverse bias performs the switching operation, if the light emission sustain mode as well as potential Vcc reverse bias line C1
Relay to. The anode potential d of the EL element 21 rises by Vcc and returns to the state of the potential level obtained by adding the potential Vcc of the potential b of the scanning line B1 and the potential due to the residual charge.

Even when the reverse bias changeover switch 31 ₁ and the scan changeover switch 32 ₁ perform the switching operation in response to the scanning signal from the display control circuit 12 for scanning the scanning line B1, In the scanning mode in which the EL element 21 is not driven to emit light, the current source 33 ₁ is inactive and the switch 43 ₁ is on, so the drive current is not supplied to the drive line A1. At this time, the anode potential d is about 3V
Becomes

Further, in the above-described embodiment, it is not necessary to supply the bias control signal from the display control circuit 12 every scan. For example, the bias control signal may be supplied only once every predetermined number of scans. Further, in the above-described embodiment, the drive lines A1 to Am are made equal to the ground potential by the switches 43 ₁ to 43 _m .
The switches 43 ₁ to 43 _m are not necessary if their output lines are at ground potential when the current sources 33 _{1 to} 33 _m are inactive.

FIG. 5 further illustrates another embodiment of the present invention. In the display device of FIG. 5, the scanning changeover switch 32 ₁ in the scanning reverse bias circuit 13 of the device of FIG.
To 32 _n are not provided, the scanning line B1~Bn is configured to always applied potential Vcc. Although the scanning signal is supplied from the display control circuit 12 to the scanning reverse bias circuit 13, the bias control signal is not supplied. Other configurations are the same as those of the display device of FIG. Light emitting cell 20
The cathode lines of EL elements of _{1,1 to} 20 _{m, 1} are scanning lines B1 to B
The potential Vcc may be directly applied without passing through n.

In the display device having the structure shown in FIG. 5, the EL element 2 of the light emitting cell 20 _1,1 is controlled by the display control circuit 12.
The operation in case 1 is driven to emit light will be described with reference to FIG. The operating mode of the light emitting cells 20 _1,1 in the case of light emission of the EL element 21 of FIG. 5, as shown in FIG. 6, the scanning mode the light emitting cells 20 _1,1 to 20 m, ₁ line is scanned And a light emission mode in which the EL element 21 emits light immediately after the scanning is completed.

In the scan mode, the display control circuit 12
Reverse bias selector switch 31 in accordance with the scanning signal from
₁Performs the switching operation, and the reverse bias selector switch 3
1₁The potential Vcc is relayed to the reverse bias line C1 by
It At the same time as this relay operation, the EL element 21 emits light.
According to the drive control signal from the display control circuit 12, the current source 3
Three ₁Is activated to supply drive current to drive line A1,
Chi 43₁Turns off.

Since the diode 22 is turned on, the drive current from the current source 33 ₁ is applied to the drive line A1 and the diode 2
2, the capacitor 23, the reverse bias line C1, and the reverse bias selector switch 31 ₁ to flow into the ground.
That is, the driving current charges the capacitor 23 as a charging current. When the charging current flows, the cathode potential b of the EL element 21 is Vcc, the anode potential d is lower than Vcc,
Since it is about 7V + Vγ, the EL element 21 is in a reverse bias state and does not emit light.

Here, the storage capacity of the EL element 21 is Cel
l, and the storage capacity of the capacitor 23 is C23, Vβ
Since the voltage Vcc is divided by the two storage capacitors Cell and C23, Vγ = Vcc × Cell / (Cell +
C23). Keep the potential Vcc high enough so that C23>
If, for example, C23 is set to be 2 to 4 times that of Cell so that it becomes Cell, the inter-terminal voltage Vel of the EL element 21 becomes
l is about 7V + Vγ-Vcc, which is smaller than 0V. Therefore, the EL element 21 is in a reverse bias state, and the EL element 21 is given a refreshing action.

Next, when the scanning time assigned to the lines of the light emitting cells 20 _{1,1 to} 20 _{m, 1} elapses, the contents of the scanning signal and the drive control signal from the above display control circuit 12 change, and the potential is changed. Although b remains Vcc, the selected scanning line shifts to the line of the light emitting cells 20 _{1,2 to} 20 _{m, 2} . As a result, the light emission mode is set, and the reverse bias selector switch 31
₁ performs the switching operation. Reverse bias switch 3
The potential Vcc is relayed to the reverse bias line C1 by 1 ₁ . At the same time, the current source 33 ₁ stops supplying the drive current to the drive line A1 and the switch 43 ₁ is turned on, or the EL element of the light emitting cell at the intersection of the other selected scanning line and the drive line A1 emits light. Drive current is supplied to the drive line A1 and the switch 43 ₁ is turned off.

In the light emission mode, when the supply of the drive current to the drive line A1 is stopped, the potential a of the drive line A1 becomes 0V and the potential c of the reverse bias line C1 rises to Vcc. The anode potential d rises by the amount obtained by dividing the variation Vcc of the potential c of the reverse bias line C1 by the capacitance ratio of the two storage capacitors Cell and C23, and changes from Vγ to Vcc by 7V + V.
It will be cc. The EL element 21 emits light because the voltage Vell between its terminals is about 7V. The EL element 21 stops the light emission when the forward voltage of the EL element 21 falls below the light emission threshold voltage Vth (for example, 3V) due to the decrease of the stored charge, and the light emission mode ends.

It is to be noted that the reverse bias selector switch 31 ₁ performs a switching operation in response to a scanning signal from the display control circuit 12 for scanning the lines of the light emitting cells 20 _{1,1 to} 20 _{m, 1.} However, in the scanning mode in which the EL element 21 is not driven to emit light, the current source 33 ₁ is inoperative and does not supply the drive current to the drive line A1, and the switch 43
₁ is on. The anode potential d of the EL element 21 is about 3V +
The voltage becomes Vγ, and the EL element 21 is in the reverse bias state. After that, the scanning time assigned to the lines of the light emitting cells 20 _{1,1 to} 20 _{m, 1} elapses, and the selected scan line becomes
_When the line moves from _{1,2 to} 20 _{m, 2} , the anode potential d becomes 3
It becomes V + Vcc.

In each of the above-described embodiments, one light emitting cell is shown for one pixel, but in a color display matrix type display panel, three light emitting cells are provided for one pixel, that is, red light emitting cells. , Green light emitting cells and blue light emitting cells are formed. Further, in each of the above-described embodiments, the operation of the light emitting cell 20 _1,1 has been described, but the operation of each of the other light emitting cells 20 _{1,2 to} 20 _{m, n is} the same as that of the light emitting cell 20 _1,1 . It is the same.

[0034]

As described above, according to the present invention, the refreshing action can be provided with a relatively simple structure to the EL element in which the diodes are connected in series in order to improve the average luminance.

[Brief description of drawings]

FIG. 1 is a diagram showing an equivalent circuit of an EL element.

FIG. 2 is a diagram schematically showing drive voltage-current-light emission luminance characteristics of an EL element.

FIG. 3 is a block diagram showing an embodiment of the present invention.

FIG. 4 is a diagram showing potentials of respective points of the light emitting cell of FIG. 3 in respective operation modes.

FIG. 5 is a block diagram showing another embodiment of the present invention.

6 is a diagram showing potentials in respective operation modes of respective points of the light emitting cell of FIG.

[Explanation of symbols]

11 Display Panel 12 Display Control Circuit 13 Scanning Reverse Bias Circuit 14 Drive Current Supply Circuit 20 _{1,1 to} 20 _{m, n} Light Emitting Cell 21 EL Element

Front page continuation (51) Int.Cl. ⁷ Identification code FI theme code (reference) G09G 3/20 642 G09G 3/20 642D 670 670K H05B 33/14 H05B 33/14 A

Claims (14)

[Claims] 1. A light emitting circuit for causing an organic electroluminescence element to emit light, the diode element being connected in series with the organic electroluminescence element in the same forward polarity as that of the organic electroluminescence element, and the organic electroluminescence element and the diode. A capacitive element connected to a connection point with the element, a drive current supply means for supplying a forward drive current to the organic electroluminescent element and the capacitive element via the diode element in response to a light emission command, In the series circuit of the organic electroluminescent element and the diode element, the forward polarity of each of the organic electroluminescent element and the diode element is stopped by stopping the supply of the light emission drive current by the drive current supply means in response to a light emission stop command. Drive voltage in the opposite direction to Current stopping means, and while applying the voltage in the reverse direction by the drive current stopping means, the potential of one end of the capacitive element opposite to the connection point is temporarily changed to temporarily change the potential of the organic electroluminescent element and the organic electroluminescent element. A light emitting circuit comprising: a series circuit with a capacitive element; and a reverse bias applying means for generating a voltage in a direction reverse to a forward polarity of the organic electroluminescent element. 2. The drive current supply means supplies a drive current from one end of the diode element opposite to the connection point, and the connection of the organic electroluminescence element in response to the light emission command. First switching means for making one end on the side opposite to the point equal to the reference potential, and second switching means for making one end on the side opposite to the connection point of the capacitive element equal to the reference potential according to the light emission command. When,
The drive current stopping means includes a third switching means that makes one end of the organic electroluminescent element opposite to the connection point equal to a first potential higher than the reference potential in response to the light emission stop command. A fourth switching unit that makes one end of the capacitive element opposite to the connection point equal to the first potential in response to the light emission stop command, the reverse bias applying unit includes the third switching unit. When one end of the organic electroluminescence element opposite to the connection point is made equal to the first potential by the switching means, one end of the capacitive element opposite to the connection point is temporarily used as the reference. The light emitting circuit according to claim 1, further comprising fifth switching means for making the potential equal to the potential. 3. The drive current supply means has a switch that makes one end of the diode element opposite to the connection point equal to the reference potential when the drive current is not supplied from the current source. The light emitting circuit according to claim 2. 4. The first switching means and the third switching means are constituted by a single first switching switch, and the second switching means
3. The light emitting circuit according to claim 2, wherein the switching means, the fourth switching means and the fifth switching means are constituted by a single second switching switch. 5. The light emitting circuit according to claim 1, wherein the light emission command and the light emission stop command are generated in accordance with input data corresponding to a light emission period of the organic electroluminescence element. 6. A light emitting circuit for causing an organic electroluminescence element to emit light, comprising a diode element connected in series with the organic electroluminescence element having the same forward polarity as that of the organic electroluminescence element, the organic electroluminescence element and the diode. A capacitive element connected to the organic electroluminescence element at a connection point with the element, and a first potential higher than a reference potential applied to one end of the organic electroluminescence element opposite to the connection point. A potential applying means and a forward emission drive current to the capacitive element via the diode element while generating a voltage in the direction opposite to the forward polarity of the organic electroluminescent element in response to the emission current supply command. Drive current supply means to supply, and the drive power supply according to the current supply stop command. Emitting circuit, characterized in that it and a drive current stop means for generating a reverse voltage supply and its forward polarity to the diode element is stopped in the light emission drive current by the supply means. 7. The drive current supply means supplies a drive current from one end of the diode element opposite to the connection point and a current source for supplying the drive current to the capacitive element in response to the light emission current supply command. First switching means for making one end on the side opposite to the connection point equal to the reference potential, the drive current stopping means is configured to connect to the connection point of the capacitive element in response to the current supply stop command. 7. The light emitting circuit according to claim 6, further comprising second switching means for making one end on the opposite side equal to the first potential. 8. The drive current supply means has a switch that makes one end of the diode element opposite to the connection point equal to the reference potential when the drive current is not supplied from the current source. The light emitting circuit according to claim 7. 9. The light emitting circuit according to claim 7, wherein the first switching means and the second switching means are constituted by a single changeover switch. 10. The light emitting circuit according to claim 6, wherein the light emission current supply command and the current supply stop command are generated according to input data corresponding to a light emission period of the organic electroluminescence element. 11. A display panel in which a plurality of light emitting cells each including an organic electroluminescence element are arranged in a matrix, and light emission for designating a light emitting cell to be emitted among the plurality of light emitting cells according to input image data. A display device comprising: a cell designating unit; and a light emission driving unit configured to emit light from an organic electroluminescent element of a light emitting cell designated by the light emitting designating section, wherein the light emitting cell has a forward polarity with the organic electroluminescent element. And a diode element connected in series in the same direction, and a capacitive element connected to a connection point between the organic electroluminescent element and the diode element, the light emission drive means, the light emission designating means. And the organic electroluminescent device of a light emitting cell designated by Drive current supply means for supplying a forward drive current to the capacitive element through the diode element, and supply of the light emission drive current by the drive current supply means when the designation of the designated light emitting cell is completed Drive current stopping means for applying a voltage in the reverse direction to the forward polarity of each of the organic electroluminescent element and the diode element in a series circuit of the organic electroluminescent element and the diode element by stopping the drive current, In the series circuit of the organic electroluminescent element and the capacitive element by temporarily changing the potential of the one end of the capacitive element opposite to the connection point while applying the voltage in the reverse direction by the stopping means. Reverse bias applying means for generating a voltage in the direction opposite to the forward polarity of the organic electroluminescence element And a display device. 12. The display device according to claim 11, wherein the light emitting cell designating unit designates the light emitting cells to emit light by sequentially scanning a plurality of lines of the display panel. 13. A display panel in which a plurality of light emitting cells each including an organic electroluminescence element are arranged in a matrix, and light emission for designating a light emitting cell to be emitted among the plurality of light emitting cells according to input image data. A display device comprising: a cell designating unit; and a light emission driving unit configured to emit light from an organic electroluminescent element of a light emitting cell designated by the light emitting designating section, wherein the light emitting cell has a forward polarity with the organic electroluminescent element. And a diode element connected in series in the same direction, and a capacitive element connected to a connection point between the organic electroluminescent element and the diode element, the light emission drive means, the plurality of light emission On the side opposite to the connection point of the organic electroluminescence element of each cell A first potential applying unit that applies a first potential higher than the reference potential to the end, and a voltage in a direction opposite to the forward polarity are generated in the organic electroluminescence element of the light emitting cell designated by the light emission designating unit. Meanwhile, a drive current supply means for supplying a forward light emission drive current to the capacitive element through the diode element, and the light emission drive current by the drive current supply means when the designation of the designated light emitting cell is completed. And a drive current stopping means for stopping the supply of the voltage to generate a voltage in the diode element in a direction opposite to the forward polarity thereof. 14. The display device according to claim 13, wherein the light emitting cell designating unit designates the light emitting cells to emit light by sequentially scanning a plurality of lines of the display panel.